I think it's one of those noises that some folks can hear, and when we get to a certain age, we may not be able to hear it....
Like the cell phone tone that the high school kids can hear, but the teacher is older and lost that range of hearing....
The noise is normal
2016 Road Warrior 355
2015 Ram 3500 Cummins SRW 4x4 MegaCab ShortBed
2011 F150 ecoboost - Traded
2015 Jayflight 28 BHBE (sold)
2009 Jayflight 26 BH (sold)